NAD Classic 512 User manual

—
SERVICE SAFETY PRECAUTIONS (UL)
1. Use exact replacement parts for critical locations marked “ /J\ 7
2. Return lead dress to original position and re-install protective covers.
3.
Before
returning
to
customer,
test
for
shock
hazard;
use
either
mothod
A
or
B:
ICE MANU,
A. Leakage test “cold”:
1. Unplug the AC cord; turn power switch ON.
2. Connect one lead of High Voltage Insulation Tester to both prongs of the AC plug.
3. Touch other lead to all exposed metal parts.
4, Impedance measurement must be 0.3-5.0 Megohms.
B. Leakage test, “live” :
1. Plug unit directly into the AC outlet: do not use isolation transformer.
2. Connect one lead of the Leakage Current Tester to earth ground.
3. Touch other lead to all exposed metal parts.
COMPACT
DISC PLAYER
SER
on
or—
| Lo
ou
a
o
=o
O02
(Oa)

SAFETY INFORMATION
CAUTION
CAUTION .- INVISIBLE LASER RADIATION WHEN OPEN AND
INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM.
ADVARSEL - USYNLIG LASERSTRALING NAR DEKSEL APNES
OG SIKKERHEDSLAS BRYTES. UNNGA EKSPONERING FOR
STRALEN.
ADVARSEL - USYNLIG LASERSTRALING VED ABNING, NAR
SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION. UNDGA
UDSATTELSE FOR STRALING.
VARING - OSYNLING LASERSTRALNING NAR DENNA DEL AR
OPPNAD OCH SPARRAR AR URKOPPLADE. STRALEN AR
FARLIG.
VARO! - AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET
ALTTINA NAKTMATONTA LASERSATEILYLLE. ALA KAISO
SATEESEEN.
VORSICT! - UNSICHTBARE LASERTRAHLUNG TRITT AUS, WENN
DECKEL GEOFFNET UND WENN SICHERHEITSVERRIEGELUNG
UBERBRUCKT IST. NICHT DEM STRAHL AUSSETZEN.
CLASS j
LASER PRODUCT
The lightning flash with arrowhead, within an equilateral tri- The exclamation point within an equilateral triangle is intend-
angle is intended to alert the user of the presence of ed to alert the user of the presence of important operating
uninsulated "dangerous voltage" within the product's and maintenance (servicing) instructions in the literature
enclosure; that may be of sufficient magnitude to consti- accompanying the appliance.
tute a risk of electric shock to persons.
THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES.
OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS :-
(1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND
(2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECIVED,
INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED
OPERATION.

7
CONTENTS
DESCRIPTION PAGE
SPECIFICATIONS: si cesiccatadecstcaspasyausgeeh nctiee wes 5e ag ce gelasaweitnas-aaeus ta raamg naa ddebeddagniaea nraiebopnanteaeueniae 4
REAR: PANEL? FRONT PANEL VIEW siicias uct anomie ednesinctexeneasadie Ga ar cacuren nurs ane 5
BOCK DIAG EAD iiaslesia duc exiaute copsetere buak a ae cay Saananug sa vieiilneesealacearnia vain aeaniiney tatalaahan eatin ieiad taaiamenae 6
VEN Ce TAG oc occe dctsin So sbeet tcealagnmsesisa utess od ed vag lenses spe qu dusstaa phaiavnedatanteusuauaaesnennera sat doaaieudnecie ri
DISASSEMBLY INS TRUCTIONS 4 itsnkea ieneoa nese ncaa ee ee 8
ADIGNMENT PROCEDURE, sisieicsetacaespenstrsdeaeuraiccantsg nasntateapeatancuen ned lecumn eaeieuatanscii ssa tuaus pense 9-11
GUIDANCE ON FOCUS AND TRACKING GAIN ADJUSTMENT ...........::cecescsecerssessessseasseaeeenes 12
IM PORTANT NO PES ss scncetesnSocrsnabeaaras dues wusscien cri sdnaceh ctapaisieatoerpoveuselacdvagaasuvagaan aes betacatesaneagedaaes 13 -14
POBLAVOUT (PARTS. SIDE): ocsssastociesecianckaciseatiNlanenevnelwteierenste ardamrtiannucatecni aime 1316
SCHEMATIC DIAGRAM swinsiy Siscdunn ros tanientsssiadcesstecentaiteah nos vaesd ease tenoadstnsedsaninesseguan anpanmanteasaracsiisdes 10718
IG BLOCK DIAGHAM siceviccutcs unasalon tab iieclne taharaecupeaeseusies uneatuaauie ia aacaataaiatntditagunly elasccdaisbenecainte 19 -21
TROUBLESHOOTING: GUIDE co. c.saeast.atun sates wticannausberouaiienesudstuneta de avadoGaaaatiatgel usagi ssvesiaadhcusaueccianeatial 22
EXPLODED VIEW cts, iitesacateselosei.Geinerastuelsqade cipluntinuctharks esbantenupoieaas aleve deeduugandt buleutenvatvaalatteneancs 23
EXPLODED: VIEW PARTS UIST icc sciccnstesasnvinedautisaduen ea ciusasatecatinantsaanusiiran diem ectsaesselapnediedesiiriiaes 24
MECHANISM EXPLODED VIEW een earner ron era ich SraakestSeastiss 25 -27
BLECTRIGAL PARAS LIST cccadeduccachcosstesientan iamicouet ceauiywaiaiaias Shakin nincon nna teuteebagnaadvieteange 28 -30
PACKING: DIAGHAIWE ssc: chticninnaidarcetniacSeaie cod iuldscdatsincitvtieatemeavautinadac iar etieey cadens idvaeuneatigvedmendeces 31

SPECIFICATIONS
DIS Cae CIN ssese eh wai erate bcctmataetetns Matera etnies One Disc, 120 or 80 mm
Programming Capacity .............: spate ab ezesktec skins 21 Tracks
Decoding ........... begieadce Leta es sch uesenmenced esters eataenereutdecasne MASH 1-bit converter
DI GItEL FIER faiipcescsiadtesaniyaanaoayiecsvotueieiaseveoseenndeer eons 4 Times oversample
Linear phase with 18 bit coefficients
POG FINS R ecweceicca ig tinted ewevianieieideeodasecesreinaniatadedest 5 pole active
FIOQUENCY RESPONSE sist cwcnensisseeatieeasnoteceesianesdaniens 5 Hz - 20 kHz +0.5 dB
Des Emphasis ror ccs tis neisunansuy Aveeesermccre tataeieeee +0.3 dB
TAD (et OB. A KEIZ) avg ee ee eancasaminn 0.0025%
Intermodulation Distortion 0... eee eetcceeeeessteeeeeeees < -100 dB
(19 + 20 kHz)
DYNEMIC RANGE sihsscrssiiensreeusess ecmeceedsnmnedeivarenvedininos 98 dB
LIMB AIWY shcisacieicetnenrtettntinasadenenatemens annua daa +0.5 dB, 0 dB to -90 dB
Signal / Noise Ratio (A-Weighted) «0.00... ee 105 dB, De-Emphasis on
108 dB, De-Emphasis off
Channel Separation 1 KHZ oo... eee eeeeseeenerteeees > 100 dB
OUTIL A esoaes sinnodtentcivan ten utes teene > 90 dB
MOWING PICO occaczcctiaiesn dain iy ontnaun seit cedures: Sheotatsasisaece Unmeasurable (Quartz Crystal Accuracy)
OUTDUT IMPCUANCS eres cctasictbcctaverscnivaratensysissadlenouss 120 2
Output levelat0 OB i ckivavivestuicneareteuseaee ee iseecauttes 2.2 Vrms
Digital Error Comecton: aceisisssoiveisn ccptatsancepebeasesuacsbone CIRC with double error correction
in C1 and C2 .
Digital: Code Output sg. ceceiendi aces ears lissnvavenanasid ealeemerana Sony / Philips serial data format
Remote Controvu nit a sesssceiun ea dteepeniaiionctansteeaes Yes
CONTROLS
Random, Play / Pause, Stop, Skip (< >), Scan (< >), Program, Time, Repeat.
PHYSICAL SPECIFICATIONS
Dimensions 435 x 93 x 295 (mm)
(Width x Height x Depth)
Net weight 4.4 kg (9.7 Ibs)
Shipping weight 5.6 kg (12.35 Ibs)

REAR PANEL / FRONT PANEL VIEW
REAR PANEL
1. LINE OUTPUT
2. NAD LINK IN / OUT
FRONT PANEL
LON Ole Oh
Compact Disc Player 512
POWER ON / OFF
DISC DRAWER
OPEN
PLAY / PAUSE
STOP
DISPLAY
TIME
3. DIGITAL OUTPUT
4, AC LINE CORD
10:
12.
13.
14.
PROGRAM
REPEAT
SKIP Back (<< )
. SKIP Forward ( BP )
SCAN Back ( << )
SCAN Forward ( > )
RANDOM
© 1995 NAD ELECTRONICS LTD. 512
© 1995 NAD ELECTRONICS LTD. 512

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WIRING DIAGRAM
POWER CORD
POWER PCB
MAIN
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DISASSEMBLY INSTRUCTIONS
TOP COVER REMOVAL
1; Remove machine screws M 4.0 x 6.0 (@) to ® ) from the side panels.
Remove tapping screw 3.0 x 8.0 © from the back panel.
Refer to figure No. 1.
Figure No. 1. @)
2. Pull both sides of the TOP COVER slightly outwards and tilt approx. 35° and then remove in
the direction as indicated by pointer @) in figure No. 2.
Figure No. 2.

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ADJUSTMENT POINTS DIAGRAM
© P109
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<=
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F501
T800mA/250V
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NAD - 512 PCB ADJUSTMENT POINTS DIAGRAM
ALIGNMENT PROCEDURE
REQUIRED INSTRUMENTS:
SPECIAL
JIG
(SEE
FIG.
1),
OSCILLOSCOPE
(BANDWIDTH
GREATER
THAN
40
MHz)
FREQUENCY COUNTER AND TEST DISC (SONY YEDS-7).

Step A: PLL Adjustment
(1)
Turn
power
ON
and
press
the
STOP
key.
(2)
Short
circuit
P108
(ASSY)
to
P107
(GND).
(3)
Connect
the
frequency
counter
to
P106
(CLK)
and
P107
(GND).
(4)
Adjust
RV101
for
a
reading
of
4.2318
+/-
0.01
MHz.
(5)
After
this
adjustment
is
completed
remove
the
short
circuit
between
P108
and
P107.
Step B: RF Adjustment
(1)
Load
the
test
disc
and
set
the
unit
into
PLAY
mode.
(2)
Connect
the
scope
to
P109
(RF)
and
P107
(GND).
Scope
setting:
Coupling
:
AC.
Vertical sensitivity : 0.2 V/div.
Horizontal time base : 0.5 uS/div.
(3)
Adjust
RV102
so
that
the
3T
component
of
the
waveform
is
maximum
and
the
eye
pattern
is
at
its
best
shape
(see
Fig.
2).
Step
C:
EF
Balance
adjustment
(1)
Turn
the
power
OFF,
remove
P111
and
replace
it
with
the
special
jig
shown
in
Fig.
1.
(2)
Connect
the
scope
as
shown
in
Fig.
1
and
switch
the
jig
to
the
"ON"
position.
Scope
setting:
Coupling
Z.DC.
Vertical
sensitivity
:
0.5
V/div.
Horizontal
time
base
:
2
mS/div.
(3)
Load
the
test
disc
and
put
the
unit
into
PLAY
mode.
(4)
Adjust
RV103
so
that
the
tracking
error
waveform
is
symmetrical
(see
Fig.
3).
NOTE:
BEFORE
CONTINUING
REFER
TO
PAGE
12
FOR
GUIDANCE
ON
FOCUS
AND
TRACKING
GAIN
ADJUSTMENT.
Step
D:
Focus
gain
adjustment
(1)
Put
the
unit
into
play
mode.
(2)
Switch
the
special
jig
to
"OFF"
and
leave
the
scope
connected.
(3)
Connect
Scope
setting:
Coupling
ca
BIG
Vertical
sensitivity
:
0.1
V/div.
Horizontal
time
base
:
2
mS/div.
(4)
Adjust
RV105
so
that
the
DC
level
is
between
120
and
200
mV.
(5)
Turn
the
power
OFF,
remove
the
jig
and
return
the
original
socket
to
P111.
Step
E:
Tracking
gain
adjustment
(1)
Turn
the
power
ON,
load
the
test
disc
and
press
PLAY.
(2)
Connect
the
scope
to
pin
3
of
P111.
Scope
setting:
Coupling
:
DC.
Vertical
sensitivity
:
0.2
V/div.
Horizontal
time
base
:
2
mS/div.
(3)
Adjust
RV104
so
that
the
waveform
is
as
shown
in
Fig.
4(a).
FIG. 1
O
TO SCOPE